A \( { }^{2 n} C_{n+1} \)
B \( { }^{2 n} \mathrm{C}_{\mathrm{n}} \)
C \( { }^{2 n} \mathrm{C}_{\mathrm{n}-1} \)
D \( { }^{2 n+1} C_{n} \)
Correct Answer: Option A
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